package com.project.forum.services.impl;

import com.project.forum.common.AppResult;
import com.project.forum.common.ResultCode;
import com.project.forum.dao.UserMapper;
import com.project.forum.exception.ApplicationException;
import com.project.forum.model.User;
import com.project.forum.services.IUserService;
import com.project.forum.utils.MD5Util;
import com.project.forum.utils.StringUtil;
import com.project.forum.utils.UUIDUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.Date;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User:DELL
 * Time:22:35
 */
@Slf4j
@Service
public class UserServiceImpl implements IUserService {

    @Resource
    private UserMapper userMapper;
    @Override
    public void createNormalUser(User user) {
        //1.非空校验
        if(user==null|| StringUtil.isEmpty(user.getUsername())
        ||StringUtil.isEmpty(user.getNickname())||StringUtil.isEmpty(user.getPassword())
        ||StringUtil.isEmpty(user.getSalt())){
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常，统一抛出ApplicationException
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }

        //2.按用户名查询用户信息
        User existsUser = userMapper.selectByUserName(user.getUsername());
        //2.1判断用户是否存在
        if(existsUser!=null){
            //打印日志
            log.warn(ResultCode.FAILED_USER_EXISTS.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_EXISTS));
        }

        //3.新增用户流程,设置默认值
        user.setGender((byte)2);
        user.setArticleCount(0);
        user.setIsAdmin((byte) 0);
        user.setState((byte) 0);
        user.setDeleteState((byte) 0);
        //当前日期
        Date date =new Date();
        user.setCreateTime(date);
        user.setUpdateTime(date);

        //写入数据库
        int row = userMapper.insertSelective(user);//影响的行数
        if(row!=1){
            //打印日志
            log.info(ResultCode.FAILED_CREATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_CREATE));
        }
        //打印日志
        log.info("新增用户成功，username="+user.getUsername()+".");
    }

    @Override
    public User selectByUserName(String username) {
        //非空校验
        if(StringUtil.isEmpty(username)){
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //返回查询结果
        return userMapper.selectByUserName(username);
    }

    @Override
    public User login(String username, String password) {
        //非空校验
        if (StringUtil.isEmpty(username)||StringUtil.isEmpty(password)){
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_LOGIN));
        }
        //按用户名查询信息
        User user=selectByUserName(username);
        //对查询结果做非空校验
        if(user==null){
            //打印日志
            log.warn(ResultCode.FAILED_LOGIN.toString() + ", username = "+username);
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_LOGIN));
        }
        //对密码做校验
        String encryptPassword = MD5Util.md5Salt(password, user.getSalt());
        //用密文和数据库中存储的密码进行比较
        if (!encryptPassword.equalsIgnoreCase(user.getPassword())){
            //打印日志
            log.warn(ResultCode.FAILED_LOGIN.toString() + ",密码错误， username = "+username);
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_LOGIN));
        }
        //打印登录成功的日志
        log.info("登录成功，username = "+username);
        //登录成功，返回用户信息
        return user;
    }

    @Override
    public User selectById(Long id) {
        //非空校验
        if (null == id){
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_LOGIN));
        }
        //调用DAO查询并获取对象
        User user = userMapper.selectByPrimaryKey(id);
        return user;
    }

    @Override
    public void addOneArticleCountById(Long id) {
        if (id==null||id<=0){
            //打印日志
            log.warn(ResultCode.FAILED_BOARD_ARTICLE_COUNT.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_ARTICLE_COUNT));
        }
        //查询用户信息
        User user = userMapper.selectByPrimaryKey(id);
        if (user==null){
            //打印日志
            log.warn(ResultCode.ERROR_IS_NULL.toString()+",user id"+id);
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_IS_NULL));
        }
        //更新用户的帖子数量
        User updateUser =new User();
        updateUser.setId(user.getId());
        updateUser.setArticleCount(user.getArticleCount()+1);
        int row = userMapper.updateByPrimaryKeySelective(updateUser);
        if (row!=1){
            //打印日志
            log.warn(ResultCode.FAILED.toString()+",受影响的行数不等于1.");
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED));
        }
    }

    @Override
    public void subOneArticleCountById(Long id) {
        if (id==null||id<=0){
            //打印日志
            log.warn(ResultCode.FAILED_BOARD_ARTICLE_COUNT.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_ARTICLE_COUNT));
        }
        //查询用户信息
        User user = userMapper.selectByPrimaryKey(id);
        if (user==null){
            //打印日志
            log.warn(ResultCode.ERROR_IS_NULL.toString()+",user id"+id);
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_IS_NULL));
        }
        //更新用户的帖子数量
        User updateUser =new User();
        updateUser.setId(user.getId());
        updateUser.setArticleCount(user.getArticleCount()-1);
        //判断用户的发帖数是否小于0
        if (updateUser.getArticleCount()<0){
            updateUser.setArticleCount(0);
        }
        int row = userMapper.updateByPrimaryKeySelective(updateUser);
        if (row!=1){
            //打印日志
            log.warn(ResultCode.FAILED.toString()+",受影响的行数不等于1.");
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED));
        }
    }

    @Override
    public void modifyInfo(User user) {
        //非空校验
        if (user==null||user.getId()==null||user.getId()<=0){
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //检验用户是否存在
        User existsUser = userMapper.selectByPrimaryKey(user.getId());
        //用户不存在
        if (existsUser==null){
            //打印日志
            log.warn(ResultCode.FAILED_USER_NOT_EXISTS.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_NOT_EXISTS));
        }
        //定义一个标志位校验所有参数为空
        boolean checkAttr = false;//表示没有校验通过
        //定义一个专门用来更新的对象，防止用户传入的User对象设置了其他的属性
        //当使用动态SQL进行更新的时候覆盖了没有经过校验的字段
        User updateUser =new User();
        //设置用户Id
        updateUser.setId(user.getId());
        //对每一个参数进行校验并赋值
        if (!StringUtil.isEmpty(user.getUsername())
        &&!user.getUsername().equals(existsUser.getUsername())){
            //需要更新用户名时，进行唯一性校验
            User checkUser = userMapper.selectByUserName(user.getUsername());
            if (checkUser!=null){
                //用户已存在
                //打印日志
                log.warn(ResultCode.FAILED_USER_EXISTS.toString());
                //抛出异常
                throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_EXISTS));
            }
            //数据库没有找到相应的用户，表示可以修改用户名
            updateUser.setUsername(user.getUsername());
            //更新标志位
            checkAttr=true;
        }
        //校验昵称
        if (!StringUtil.isEmpty(user.getNickname())
        &&!user.getNickname().equals(existsUser.getNickname())){
            //设置昵称
            updateUser.setNickname(user.getNickname());
            //更新标志位
            checkAttr=true;
        }
        //校验性别
        if (user.getGender()!=null
        && user.getGender()!=existsUser.getGender()){
            //设置性别
            updateUser.setGender(user.getGender());
            //合法性校验
            if (updateUser.getGender()>2||updateUser.getGender()<0){
                updateUser.setGender((byte) 2);
            }
        }

        //校验邮箱
        if (!StringUtil.isEmpty(user.getEmail())
                && !user.getEmail().equals(existsUser.getEmail())) {
            // 设置邮箱
            updateUser.setEmail(user.getEmail());
            // 更新标志位
            checkAttr = true;
        }
        //校验电话号码
        if (!StringUtil.isEmpty(user.getPhoneNum())
                &&!user.getPhoneNum().equals(existsUser.getPhoneNum())){
            //设置邮箱
            updateUser.setPhoneNum(user.getPhoneNum());
            //更新标志位
            checkAttr=true;
        }
        //校验个人简介
        if (!StringUtil.isEmpty(user.getRemark())
                &&!user.getRemark().equals(existsUser.getRemark())){
            //设置邮箱
            updateUser.setRemark(user.getRemark());
            //更新标志位
            checkAttr=true;
        }
        //根据标志位决定是否可以执行更新
        if (checkAttr==false){
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //执行sql更新,调用DAO
        int row = userMapper.updateByPrimaryKeySelective(updateUser);
        if (row!=1){
            //打印日志
            log.warn(ResultCode.FAILED.toString()+",受影响的行数不等于1.");
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED));
        }
    }

    @Override
    public void modifyPassWord(Long id, String newPassword, String oldPassword) {
        //非空校验
        if (id==null||id<=0||StringUtil.isEmpty(newPassword)
                ||StringUtil.isEmpty(oldPassword)){
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //查询要修改的用户信息
        User user = userMapper.selectByPrimaryKey(id);
        //校验用户是否存在
        if (user==null||user.getDeleteState()==1){
            //打印日志
            log.warn(ResultCode.FAILED_USER_NOT_EXISTS.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_NOT_EXISTS));
        }
        //校验老密码是否正确
        //对老密码进行加密,获取密文
        String oldEncryptPassword = MD5Util.md5Salt(oldPassword, user.getSalt());
        //与用户当前的密码进行比较
        if (!oldEncryptPassword.equalsIgnoreCase(user.getPassword())){
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //生成一个新的盐值
        String salt = UUIDUtil.UUID_32();
        //对新密码进行加密
        String encryptPassword=MD5Util.md5Salt(newPassword,salt);
        //构造要更新的对象
        User updateUser=new User();
        updateUser.setId(user.getId());//用户id
        updateUser.setSalt(salt);//新生成的盐
        updateUser.setPassword(encryptPassword);//新密码生成的密文
        Date date=new Date();
        updateUser.setUpdateTime(date);//更新时间
        //调用DAO
        int row = userMapper.updateByPrimaryKeySelective(updateUser);
        if (row!=1){
            //打印日志
            log.warn(ResultCode.FAILED.toString()+",受影响的行数不等于1.");
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED));
        }

    }


}
